Read the following statements and choose the following option: 1. In C3 plants, no O2 binds toRubisco 2. Rubisco has a much greater affinity for CO2 3. The C4 acid OAA is formed in the mesophyll cells. 4. In C3 plants some O2 does bind to R

Question

Read the following statements and choose the following option: 1. In C3 plants, no O2 binds toRubisco 2. Rubisco has a much greater affinity for CO2 3. The C4 acid OAA is formed in the mesophyll cells. 4. In C3 plants some O2 does bind to RuBisCO, and hence CO2 fixation is increased.

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Correct answer: B. Both 2 and 3 are correct

RuBisCO has a much greater affinity for CO2 when the CO2: O2 is nearly equal. Imagine what would happen if this were not so! This binding is competitive. It is the relative concentration of O2 and CO2 that determines which of the two will bind to the enzyme.

Read the following statements and choose the following option: 1. In C3 plants, no O2 binds toRubisco 2. Rubisco has a much greater affinity for CO2 3. The C4 acid OAA is formed in the mesophyll cells. 4. In C3 plants some O2 does bind to RuBisCO, and hence CO2 fixation is increased.

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